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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df4e40edc1b98ac9b86115d0f2573fc9c36301c20acff06d865c37a28f2ffc5' 
  AND token = 'EY5i20PypKg1jCsCU0VblKWKbI+L9bMaj0o+BComIiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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