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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409c9808eb21a33bc087f8ed2168d23a0c5753c09657bad7319191d63a4e5c3b' 
  AND token = 'Pm0R0+vYRhd2MPto9F1os4uI68vEMdqcW0+t3xl7xy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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