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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7954d48cd744462ff8ecb15d75a1c70a46820fc7284a49652f56105d6c2c056e' 
  AND token = 'tUeN/ek7c1kQ/8L2UiV2g5Ol38jM/DFFpk5whjgHN3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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