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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '567e5172ee982d125096f1f2d28e89c454c24032b3e2a09fc42c90c30aec366a' 
  AND token = '9kBOo4f5CPE29cSr5B2ArKFstgrhW9sdt/Eoz7Htx0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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