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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc6ed4d0d361075e8f9cb303131b842ae7e194e1f6085bf0bacae28274615614' 
  AND token = 'QttgokWPOfdebrFSuAzmZFnKHO7+Ry9HljafZwhOD2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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