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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d16140290dc0d4e2a45085784051771457d5a58cc8f376f5cd852b32e147e4d' 
  AND token = '3uB29dpRH0ZO5EaJ9KtssolTuDUt1VyCiW+u8U3yUg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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