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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1235f0eb065bb9865576f42c94b95a86dadccd76b9fb381e12195860fb70c31c' 
  AND token = 'VGIQ5rZBr4oh3t5S6onfS7GkhOBLOPye5Pc7/THzB/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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