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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836404eda890d44e285ec3541933d214b1d8e6275db9c1d37395919ab719694e' 
  AND token = 'sE37lGQapG80G4AsedLfw8h6oR1GkIYT8GywA0SRKcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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