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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07ebbb8f1d098a1e4fa7141559e635f52f58442e2bdae4ec87cfa62948984c0' 
  AND token = '28n6GasgDf+5ejNl+kXua4H02KrJyzrOysAzFxS1A94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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