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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53f3950291d1488b83b27612ae978497838c8514bc809c63a84e35a75d39eb9' 
  AND token = 'Ejhb+opbqHNsErt/BiVZt/AOaLT8OR2vGuDFvrFTvtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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