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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b3c91a9753e47848c14d2cda63da711a3dd598b76183c19a0a013aa2004cb6e' 
  AND token = '964qD6cXOAj+Lt5LUgOwt8wlgaFJxH5synX+Kw7A26c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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