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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e450fc149fadfaef9b936892d17bf537d45d19134a911ff4df37adf1c554f01c' 
  AND token = '41/pKOTLIWC8u5pJUAg+wNyxBUyduN0CZAzHUxa5NIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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