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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32c1e3238d1e8ec7f1517d0a7164770d8863575e96fb3b5bde28c7cf3a5399af' 
  AND token = 'C+VG4KTWU17yDNuhbrjNztGLfBXkeBAih51GWiepPfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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