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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afac53a8fd25710202fdaf75cd49eb403ac8d08121b1d2c3ac4d12df2a1ff89c' 
  AND token = 'gURnbDB9X4vIkl3a6gmVCSej3oNNQFTc53B8vfv7H1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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