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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332f75be8d06abb72e8c85fdb98532b7e37c7507b53c62fc4f1e25611ff1c2ff' 
  AND token = 'BCxtFYRcPfq8AaFoS/rbGGJx079R5jTcCOFUpQGwvM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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