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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d30b976e85c18f5ecf501cf53eb20150aad7d010433ec3cb672d4a4aa4e5a66' 
  AND token = '9EA/e1SjbXXUOwstvNsFW40BjckIiCEiZS6vfkavDyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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