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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '887acb056bd74c5ab964f7273d1b979e4bea8bf8cc37438eaff2cbe605f7bfc1' 
  AND token = 'A/rcpJg70YZ/6QdwMDKx3Jagk8wWg8bRyQFVyxGaneA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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