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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a070f498b5099c94883c7c243997415aeaaba787cfef00a9d8a53970df4d3f49' 
  AND token = 'UcXpNWs112NLY3LnOI/T3HftTb+vTLxdT7/edV62V58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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