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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a386bb5ed16875ef039bd915413d73a78b71f474d9f56978f56fa11bd4fd6ab7' 
  AND token = '+bVe9A/6W2AV1gRF+fsqzue6ADPN+2xeS+WX7OIafp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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