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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b975df340d1a323a92ed048cc66ee89c970fbae66e2367716a86f80171b5664' 
  AND token = 'nsEwSegkusX0Fi1AS0OirpyfdARls+8yI+BnyBSissM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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