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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7bc143ae0220fc9ea5519ec74d8e79182e42b9413720dd9e5dc7e42b070bf62' 
  AND token = 'yc6XIHUJFJyZWZ3/lUYDWk2AeOILWSoK+lNQB5iETxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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