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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d7c091354ecea1e51822dce7ea5d789f22f2d9884c56ae3a474673d8c4510be' 
  AND token = 'xRqYbHWIIV6lMVJ8QYH3y6v2Y0tV89uPwwS4lu/EInw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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