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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5dc51228cd0367189530995e2a770acce589619d0ac1a9d4dbcd7513ce4f50c' 
  AND token = 'cP6ZEdnWhU3W27BgbiVRLbfgx/Q7hF2C6vY6ksQt8x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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