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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa1c0fd9c8f44101b55a58bf3f5e2ba4f54314312837576e89f452b90b8dcdae' 
  AND token = '+y8YUVnAnVz2WMAGmzR3+3L+ettxLq/PAI7+D427gX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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