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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b976f20c0e30fa3239d4c2bc48301ca0debc1b048966c0aea0bd6312b137c9ab' 
  AND token = 'aDfShZuNfA0ejMsuq/m7IYvLDRqmW+y3OOdlBRvzYVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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