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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a62ce1bc1beadc8bc64ecfdf55e38e46b06ae212965151d48e06a4f033ba0e9' 
  AND token = 'ctryFmYefuIx1Px2QAKwP9oUlsg6kywJyzp1eoFhYaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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