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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '542345448de9a06c21395b46bbcc1ccbf2565aec98ec60e6626b0093155fa47e' 
  AND token = 'KgLvU4ItDRnM5ona6tCCaQ6upNt/b1BHCJEpYgqIPCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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