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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f32f87580f795645ab5f1d45d3975ac364c61d5c0b34639f577deb328b709f' 
  AND token = 'AXHei+cwanf1Gj8OA8DciwxQus08h6nJRFPG39dmavI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00121

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}