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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cae7d8d65d0ca1e6472e4d44a972796c7d339ac60bae11a85371c390e567fee' 
  AND token = 'SXEoWsz4fYPO68PztUeF8FX2pp7iLGJffFGGaRYhSUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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