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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61aa65d7fc55ac23efd92b7d594216b46016b344df6335d97f6f03efe062c539' 
  AND token = 'NsoDHj6CTX3BL1JtUwwxdIykEDRgvEANCFOQ/mtDFeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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