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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c52166dfbb4ef89a91d2cf4cc2fb7a44b23e3959f8e7414640eff05d6bd8f36' 
  AND token = 'XR2CQI2rJ0QOpoAfOPd+LyydFv872OWWxVmHGlMf3+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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