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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0552546f2f9da3cd044ef9d92fc5d306b19c57b4b5e62114ce510a62c508e5c1' 
  AND token = '2iHhn2fId8iagToEKlgj0wOuqqERc+vP6p3aznTmPGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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