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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bccd477dd6742eff69917f7128cd6b0b99b7b00e699669a66989a99c017f643' 
  AND token = 'avbZ15tA9oYBs6lJyOQ1cfUnCzg9mPb64P8Q/L3Iu8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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