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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39165145fd45c78327d21115d4f5dcfa3ef6de2ca06cab1fbb8556012f12981e' 
  AND token = 'qZfJ+Gvq0lc7GWmb0ax4EWyrncSP6x9M1911nYgf934=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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