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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7542fef36653b6636e833857e2816738baeb296bcf5d01ea09f4456fdae624' 
  AND token = 'hVJQkIALeWJcq1Kfgx0yj0FQxctMfyDZoCAzMkbD0NU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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