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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b497ca75f5fb6fe3bfd2e933a01969c5660869d1773e0c1144e183a63d301d68' 
  AND token = '7lIDnuXXDUeKtXykQnFwZqLsvs1FvSnwTefw+eQnU1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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