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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923bd9b45227b9ca473fed35a8f2b73afe176e3cd1838b18adf3b6d1adc443a0' 
  AND token = 'dcRTLjgpl1Dy79JuR8GEmyq2MNKWUrwcJFA7g3UqsLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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