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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e28040a01ad72ffe8697fac8239f900e16aaae4214f7d941e4c93fb6d51943c' 
  AND token = 'l09esbCMfvLOmBfnha91iNZ1orzXYH3SChA4Lbsft2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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