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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f8708f9a9d43647aa5c30abeff5da4ff529930cbc34397c5e3dfa87d418c3de' 
  AND token = 'jcNQr26Gg8F2yx1cezt/RGZgOh1rbcmSxiNI7XeQab4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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