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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6516666c77da7bfc857532b94b4460e2999090e7b5f94c0724c2aa3efe743d6' 
  AND token = 'NPUS3MyU5qyjiYsWJ+Xe+FxmX6uNB/iNFFKePC+bL+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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