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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc3ae01e0b4b764e74b775b3dbfa341aef15852032fde7e7321e9ca756838a8' 
  AND token = 'r/i6vWb/6ahrrgPaboYmVN3FvKiycoAOPVWe2MDe6Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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