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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e92ffc21444265f17eba05fd93bfa71202b9473afe458700f3bff2ea0fdfc2' 
  AND token = 'sNBWO3Cb0R4TVqWBgJrkNjlIzqG9kRZ8Al/MZToxPhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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