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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fdd0d4d50db89d9aa7d66ca3eac2fcb59d48f0145e32b0af04996f1c7b7231b' 
  AND token = 'gy25EFPK/62QMKZPQhfqXPSr9nRDb56yUiNS+1ySwYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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