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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '980fd9d3e0582ca240a93f3eaeea49df71a9892fbcbd14c9751919e5b7d090d2' 
  AND token = 'G6rO+qu0ptpxIs9MtV7LccEqcjAet9LlbIcMkge5rrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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