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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a152baba2d314da5f0a57a085fd5d1ca7cd8a1bc8fafac0f068c9c1abc70bbe' 
  AND token = 'CXxpKC2zyNicpdwtrMF1jyRD1VxJfKlhr3joGGFlKaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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