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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e90562ba54d41b26f40ffdff3448b88faac660b7d3897e49a1cefeba6c92817e' 
  AND token = '5S+oVHCrQifz7wlknSwoX5y+kep1Ei614I4wlpc915E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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