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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '027badb96604a51fd8f5842b1275ef65ac3965f7b735d79d7f6a8f3e40aee013' 
  AND token = '78LoDjWBMaiAcD5hnzWobmCzh8BrIpt8N6o3lCAryQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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