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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ef33f06c88c62d99ae7aac21dd1f49af803b55d3f03fce6b5b11a893df3e1c' 
  AND token = '+ROTvyJMbifJmwkY8bXF+UnZyLyNP+mASiLyet0ywdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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