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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7ee14c116d87def6d1c195fa32e9885d1fafdb20fbd6360285aad4ca7f44c2' 
  AND token = 'hVSaH83ZaemYLXMy8vWL0TuS66AHNImKudF3t9T4/+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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