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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ac2e6f9a514cae006ced20041df069f7eb1504bc5fa38a0e6ed8cca1e1c6615' 
  AND token = 'Ow/hOQdawQevOGugsn2sq00td8+lsOvHAaAIxbt29n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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