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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0d844c03afba01fac5bda6147013f4596e16639634b6c401b34e89b5947cd1' 
  AND token = 'eV4owVlhAPIZ6uvOJgvJnLJAeDjmZs1E2igniNoHYO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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