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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ced0466d3b04b62cc99df032024e0ce091cdd20ffb4b003f81c45bc60e9634ca' 
  AND token = '9X0IDa51rTOqHJWwnsem9xckbRFus8DZA7mzGl5qyQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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