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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee264d25f00bbe2631ac39f12036b58666c73e4550c2d74687d1963425fc1ec' 
  AND token = 'Z+PzR/YSNHDG5x2kXXRT1ClJNszWbaqM8WSRKf7oF6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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