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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9b76ed54a16fd7567c5cdb43e68bc5e9484896ed282cf38b19e44edfe873ce' 
  AND token = 'DZoN8eFKHjUKG+vzegZc2weaQaT51FahVWks+ItTi68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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