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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b626e02ae91d4442a464025cf8a8ab0cb7bdf54b54679f13699cfe9310831855' 
  AND token = 'k8y5h974e/72U4OwCzGgVEIzNshFMKQw1y7Pd8q2TmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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