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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87de2d545297ed5599865bf522a9de818da79b61ed4059851c4a08bde9b3f6e0' 
  AND token = 'UEMUKyW0q52D0wbbrGETG8ZNuihQ8JW4lE3/FWHRiEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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