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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba4509e1484497538aa2e7fb0a9f980063c30f8012d899eaa103f2a89db5387' 
  AND token = 'nSEPvfa8wWl2sr18Ko6KZAKNF2y1tGZv4ZB6TX+taNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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