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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b957dda97c9c40c044696796f1a98f89e5d792e6b5d310c2a07c0e04a82dc626' 
  AND token = '4qt26jHPFQHACWJkpVshV+LFk6EbeZgl2lQimmvkp8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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